Hey Lew - I haven't researched it, I just have never seen another cartridge company talking about stylus lives of 2500-3000 hours. I typically hear 1500. Maybe 1000. If you listen a lot, a VDH will last 3-4 years. If you use another brand and get 75% of the life (probably optimistic) and it costs $500 (or more) to service the cartridge and replace the stylus, that would equate to a savings of over $125 a year (5 decent records). Plus the aggravation factor, especially if you are like me and don't have quality spares laying around to use while the work is taking place.
I don't think the upper VDH cartridge stylus replacements are much if any different than the low-mid models, so if you get higher level one, your ongoing costs shouldn't be much if anything more. A dealer I trust more than any other recommended/sold a barely used VDH to me over 10 years ago and I haven't felt the need to switch. I don't enjoy constantly testing new equipment (especially cartridges) back and forth, and unless you have a multi armed table, it is not a quick and easy thing to do. It is very difficult to remember what something sounds like in an A/B test. I'm not a tinkerer and am mainly interested in having the music I like playing as close to sounding live as possible.